572 research outputs found
Rewarded meta-pruning: Meta Learning with Rewards for Channel Pruning
Convolutional Neural Networks (CNNs) have a large number of parameters and
take significantly large hardware resources to compute, so edge devices
struggle to run high-level networks. This paper proposes a novel method to
reduce the parameters and FLOPs for computational efficiency in deep learning
models. We introduce accuracy and efficiency coefficients to control the
trade-off between the accuracy of the network and its computing efficiency. The
proposed Rewarded meta-pruning algorithm trains a network to generate weights
for a pruned model chosen based on the approximate parameters of the final
model by controlling the interactions using a reward function. The reward
function allows more control over the metrics of the final pruned model.
Extensive experiments demonstrate superior performances of the proposed method
over the state-of-the-art methods in pruning ResNet-50, MobileNetV1, and
MobileNetV2 networks
Satellite Clustering for Non-Terrestrial Networks: Concept, Architectures, and Applications
Recently, mega-constellations with a massive number of low Earth orbit (LEO)
satellites are being considered as a possible solution for providing global
coverage due to relatively low latency and high throughput compared to
geosynchronous orbit satellites. However, as the number of satellites and
operators participating in the LEO constellation increases, inter-satellite
interference will become more severe, which may yield marginal improvement or
even decrement in network throughput. In this article, we introduce the concept
of satellite clusters that can enhance network performance through satellites'
cooperative transmissions. The characteristics, formation types, and
transmission schemes for the satellite clusters are highlighted. Simulation
results evaluate the impact of clustering from coverage and capacity
perspectives, showing that when the number of satellites is large, the
performance of clustered networks outperforms the unclustered ones. The viable
network architectures of the satellite cluster are proposed based on the 3GPP
standard. Finally, the future applications of clustered satellite networks are
discussed.Comment: 7 pages, 7 figures, 1 table, submitted to IEEE Vehicular Technology
Magazin
A case of acute skin failure misdiagnosed as a pressure ulcer, leading to a legal dispute
It is difficult to differentiate acute skin failure (ASF) from pressure ulcer (PU). ASF is defined as unavoidable injury resulting from hypoperfusion caused by severe dysfunction of another organ system. We describe a case of ASF mistaken as PU that resulted in a legal dispute. A 74-year-old male patient was admitted to our intensive care unit with sepsis due to bacterial pneumonia. Despite the use of air cushions and regular position changes, skin ulcerations occurred over his occiput, back, buttock, elbow, and ankle. After improvement in his general condition, he was transferred to the department of plastic and reconstructive surgery. Debridement was performed immediately, followed by conservative treatment (including a vacuum-assisted closure device) for 6 weeks. The buttock and occiput wounds were treated surgically. Despite complete healing, his caregivers sued the hospital for failing to prevent PU formation. ASF is a pressure-related injury resulting from hemodynamic instability due to organ system failure. Unlike PU, ASF may occur despite the implementation of all appropriate preventive measures. Furthermore, misdiagnosis of ASF as PU can lead to litigation. Therefore, it is critical for the proper diagnosis to be made quickly, and for physicians to explain that ASF occurs despite proper preventative treatment
A New Hardware Correlator in Korea: Performance Evaluation using KVN observations
We report results of the performance evaluation of a new hardware correlator
in Korea, the Daejeon correlator, developed by the Korea Astronomy and Space
Science Institute (KASI) and the National Astronomical Observatory of Japan
(NAOJ). We conducted Very Long Baseline Interferometry (VLBI) observations at
22~GHz with the Korean VLBI Network (KVN) in Korea and the VLBI Exploration of
Radio Astrometry (VERA) in Japan, and correlated the aquired data with the
Daejeon correlator. For evaluating the performance of the new hardware
correlator, we compared the correlation outputs from the Daejeon correlator for
KVN observations with those from a software correlator, the Distributed FX
(DiFX). We investigated the correlated flux densities and brightness
distributions of extragalactic compact radio sources. The comparison of the two
correlator outputs show that they are consistent with each other within ,
which is comparable with the amplitude calibration uncertainties of KVN
observations at 22~GHz. We also found that the 8\% difference in flux density
is caused mainly by (a) the difference in the way of fringe phase tracking
between the DiFX software correlator and the Daejeon hardware correlator, and
(b) an unusual pattern (a double-layer pattern) of the amplitude correlation
output from the Daejeon correlator. The visibility amplitude loss by the
double-layer pattern is as small as 3\%. We conclude that the new hardware
correlator produces reasonable correlation outputs for continuum observations,
which are consistent with the outputs from the DiFX software correlator.Comment: 13 pagee, 9 figures, 3 tables, to appear in JKAS (received February
9, 2015; accepted March 16, 2015
Down-regulation of ARC contributes to vulnerability of hippocampal neurons to ischemia/hypoxia
AbstractARC is a caspase recruitment domain-containing molecule that plays an important role in the regulation of apoptosis. We examined ARC expression during neuronal cell death following ischemic injury in vivo and in vitro. After exposure to transient global ischemic conditions, the expression of ARC was substantially reduced in the CA1 region of hippocampus in a time-dependent manner with concomitant increase of TUNEL-positive cells. Quantitative analysis using Western blotting exhibited that most of ARC protein disappeared in the cultured hippocampal neurons exposed to hypoxia for 12 h and showing 60% cell viability. Forced expression of ARC in the primary cultures of hippocampal neurons or B103 neuronal cells significantly reduced hypoxia-induced cell death. Further, the C-terminal P/E rich region of ARC was effective to attenuate hypoxic insults. These results suggest that down-regulation of ARC expression in hippocampal neurons may contribute to neuronal death induced by ischemia/hypoxia
Summary of the 2017 thyroid radiofrequency ablation guideline and comparison with the 2012 guideline
Radiofrequency ablation (RFA) is a new, minimally invasive modality that serves as an alternative to surgery in patients with thyroid tumors. The Task Force Committee of the Korean Society of Thyroid Radiology developed recommendations for the optimal use of RFA for thyroid tumors in 2012 and revised them in 2017. Herein, we review and summarize the 2017 thyroid RFA guideline and compare it with the 2012 thyroid RFA guideline
Dual Synergistic Modulation of Photo-Induced Electron Transfer Processes Between Molecules and Gold Nanopillars for Ultrasensitive Plasmon-Enhanced Raman Scattering.
https://v2.sherpa.ac.uk/id/publication/25610 (Accepted version, pathway A)This work presents a synergistic approach to boost plasmon- or surface-enhanced Raman scattering (SERS) by combining
molecular and electrical modulators that fine-tune the electronic structure of metal−molecule interfaces, especially the
charge transfer (CT) states, allowing molecular resonances. Paraquat (PQ2+) was interfaced with nanopillar SERS substrates
whose surface excess of charge was modulated by intercalating anionic Au complexes (AuCl4−, Au(CN)2−) as well as by
applying external electric potentials. Such concurrent dual modulation tuned the energy of the CT states of the
substrate−anion−PQ2+ triads in resonance with the excitation laser, resulting in a large enhancement of the PQ2+ SERS bands.
The results point to a novel coherent through-bond CT contribution of SERS, analogous to the superexchange mechanism
for electron transfer in donor−bridge−acceptor systems. The large amplification enables high sensitivity for detecting PQ2+
and ultimately enables the on-site detection of PQ2+ in unprocessed real samples (coffee drink). This study account for new
physicochemical variables affecting electron transfer processes in nanostructured metal-molecule interfaces and provides a
path for further exploring chemical strategies for greater Raman enhancement and for developing ultrasensitive Raman
platforms.Fundamental Research Program (PNK 7440) of the Korea Institute of Materials Science
(KIMS)
National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (NRF-
2021R1C1C1010213)
Junta de AndalucÃa/FEDER (UMA18-FEDERJA-049 and P18-RT-4592)
Fundacion Ramon Areces (Madrid
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